Ultimaker/Cura
Dec 2024 – Feb 2026
12 Months active
Languages Used
INIcfgIniPythonJSON
Technical Skills
Configuration Management3D Printing Configuration3D PrintingConfigurationFirmware ConfigurationProfile Management
THeijmans
PROFILE
Theijmans
Tijmen Heijmans developed and maintained advanced 3D printing profiles and configuration enhancements for the Ultimaker/Cura repository over a twelve-month period. Heijmans focused on optimizing print quality, reliability, and material efficiency by engineering new profile parameters, refining temperature and retraction settings, and introducing features such as honeycomb infill and wall thickness controls. Using Python, JSON, and INI configuration languages, he implemented material-aware tuning and firmware-level adjustments to address issues like Z-resonance, over-priming, and thermal management. His work demonstrated strong configuration management and quality assurance practices, resulting in more consistent, high-speed, and reliable print outcomes across multiple Ultimaker printer models.
Overall Statistics
Feature vs Bugs
81%Features
Repository Contributions
29Total
Bugs
4
Commits
29
Features
17
Lines of code
958
Activity Months12
Your Network
36 peopleWork History
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 summary for Ultimaker Cura: Implemented key 3D printing profile enhancements focused on high-speed and tough PLA use cases. Delivered honeycomb infill for S-line High Speed profiles to replace zigzag, increasing structural integrity and material efficiency. Enforced a 75-degree maximum skin removal angle for two-walled (tough) PLA profiles, improving print quality and reliability. Changes compiled and delivered via two commits (PP-713): 87273018f7de35d8a9c2be86960806ef041746b5 and 3f8f4437d361e037cf17440f585fff0aca9fdedb. Impact includes more reliable high-speed prints, reduced material waste, and improved consistency across Cura profiles; demonstrated strong profile engineering and version-control discipline.
2 Commits • 1 Features
Feb 1, 2026February 2026 summary for Ultimaker Cura: Implemented key 3D printing profile enhancements focused on high-speed and tough PLA use cases. Delivered honeycomb infill for S-line High Speed profiles to replace zigzag, increasing structural integrity and material efficiency. Enforced a 75-degree maximum skin removal angle for two-walled (tough) PLA profiles, improving print quality and reliability. Changes compiled and delivered via two commits (PP-713): 87273018f7de35d8a9c2be86960806ef041746b5 and 3f8f4437d361e037cf17440f585fff0aca9fdedb. Impact includes more reliable high-speed prints, reduced material waste, and improved consistency across Cura profiles; demonstrated strong profile engineering and version-control discipline.
February 2026
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for Ultimaker Cura: Delivered two high-impact feature improvements that enhance print strength, material efficiency, and default behaviors. The changes include shell thickness optimization for S6/S8 profiles on PLA and Tough PLA with a minimum-wall policy for other profiles, and setting Honeycomb as the default infill for Factor 4 to optimize quality and material use. These updates reduce waste, improve part reliability, and simplify user decisions, contributing to more consistent outcomes across common materials and profiles.
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for Ultimaker Cura: Delivered two high-impact feature improvements that enhance print strength, material efficiency, and default behaviors. The changes include shell thickness optimization for S6/S8 profiles on PLA and Tough PLA with a minimum-wall policy for other profiles, and setting Honeycomb as the default infill for Factor 4 to optimize quality and material use. These updates reduce waste, improve part reliability, and simplify user decisions, contributing to more consistent outcomes across common materials and profiles.
December 2025
7 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for Ultimaker Cura highlighting key feature deliveries, major bug fixes, and overall impact. Focused on improving print quality, material handling, configurability, and reliability to deliver measurable business value.
7 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for Ultimaker Cura highlighting key feature deliveries, major bug fixes, and overall impact. Focused on improving print quality, material handling, configurability, and reliability to deliver measurable business value.
December 2025
November 2025
2 Commits • 1 Features
Nov 1, 2025November 2025 monthly highlights focused on elevating Ultimaker S8 print quality in Cura. Delivered targeted enhancements to improve reliability and material efficiency, translating investigative findings into production-ready changes for the S8 platform.
November 2025
2 Commits • 1 Features
Nov 1, 2025November 2025 monthly highlights focused on elevating Ultimaker S8 print quality in Cura. Delivered targeted enhancements to improve reliability and material efficiency, translating investigative findings into production-ready changes for the S8 platform.
October 2025
4 Commits • 3 Features
Oct 1, 2025Monthly work summary for 2025-10 focusing on key accomplishments, major fixes, impact, and technologies demonstrated for Ultimaker/Cura.
4 Commits • 3 Features
Oct 1, 2025Monthly work summary for 2025-10 focusing on key accomplishments, major fixes, impact, and technologies demonstrated for Ultimaker/Cura.
October 2025
September 2025
3 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for Ultimaker Cura: Focused on enhancing print reliability and slicing accuracy through profile-level parameterization and targeted bug fixes. Delivered three critical updates across Ultimaker S6/S8 and FDM workflows, enabling more consistent parts and reduced waste.
September 2025
3 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for Ultimaker Cura: Focused on enhancing print reliability and slicing accuracy through profile-level parameterization and targeted bug fixes. Delivered three critical updates across Ultimaker S6/S8 and FDM workflows, enabling more consistent parts and reduced waste.
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for Ultimaker/Cura: Focused enhancements to the Ultimaker S8 printer profile, delivering precision improvements and performance optimizations. Highlights include refined XY offset, hole offset, and inset direction adjustments across multiple material and layer height combinations to refine print accuracy; and a new speed_roofing setting to optimize roofing layer printing speed and efficiency. All work is traceable to commits PP-650 R3 and PP-650 R5, ensuring reviewable changes. No major bug fixes recorded for this module this month, with improvements contributing to reliability and end-user print quality.
2 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for Ultimaker/Cura: Focused enhancements to the Ultimaker S8 printer profile, delivering precision improvements and performance optimizations. Highlights include refined XY offset, hole offset, and inset direction adjustments across multiple material and layer height combinations to refine print accuracy; and a new speed_roofing setting to optimize roofing layer printing speed and efficiency. All work is traceable to commits PP-650 R3 and PP-650 R5, ensuring reviewable changes. No major bug fixes recorded for this module this month, with improvements contributing to reliability and end-user print quality.
August 2025
July 2025
2 Commits • 1 Features
Jul 1, 2025July 2025—Ultimaker Cura development: Delivered faster, higher-quality prints and strengthened safety/robustness through targeted profile work and thermal model alignment. Key improvements include new S8 quick profiles for ABS, PETG, PLA, and Tough PLA to optimize print speed and cooling, plus refinements to existing quality profiles (temperature, wall speed, line width) to improve surface finish and dimensional accuracy. A critical bug fix aligned Build Volume Temperature (BVT) limits with the F4 thermal model to prevent overheating/underheating and enhance stable temperature control during prints. These efforts reduce print failures, shorten iteration cycles, and improve end-user reliability and factory throughput.
July 2025
2 Commits • 1 Features
Jul 1, 2025July 2025—Ultimaker Cura development: Delivered faster, higher-quality prints and strengthened safety/robustness through targeted profile work and thermal model alignment. Key improvements include new S8 quick profiles for ABS, PETG, PLA, and Tough PLA to optimize print speed and cooling, plus refinements to existing quality profiles (temperature, wall speed, line width) to improve surface finish and dimensional accuracy. A critical bug fix aligned Build Volume Temperature (BVT) limits with the F4 thermal model to prevent overheating/underheating and enhance stable temperature control during prints. These efforts reduce print failures, shorten iteration cycles, and improve end-user reliability and factory throughput.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for Ultimaker Cura: Delivered a targeted feature set that enhances print quality and user experience for the Ultimaker S8. Implemented Visual Print Profiles for PLA and Tough PLA at 0.15mm layer height, with tuned print temperatures and retractions to optimize visual quality and consistency. The feature was released under PP-632 with commit bd5069bc82f98792c25280ad9573b1e978149f95, aligning with the project’s release cadence and quality gates. This work strengthens on-device usability and reduces setup time for high-quality visual outputs on S8, contributing to faster value realization for customers and clearer material-specific tuning workflows. Overall impact: Accelerated time-to-value for S8 users, improved perceived print quality, and reinforced Cura’s capability to deliver material- and printer-specific presets. Technologies/skills demonstrated: profile-based tuning, material-specific parameter optimization, version-controlled feature release, and cross-functional collaboration with QA and release engineers to validate and ship new presets.
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for Ultimaker Cura: Delivered a targeted feature set that enhances print quality and user experience for the Ultimaker S8. Implemented Visual Print Profiles for PLA and Tough PLA at 0.15mm layer height, with tuned print temperatures and retractions to optimize visual quality and consistency. The feature was released under PP-632 with commit bd5069bc82f98792c25280ad9573b1e978149f95, aligning with the project’s release cadence and quality gates. This work strengthens on-device usability and reduces setup time for high-quality visual outputs on S8, contributing to faster value realization for customers and clearer material-specific tuning workflows. Overall impact: Accelerated time-to-value for S8 users, improved perceived print quality, and reinforced Cura’s capability to deliver material- and printer-specific presets. Technologies/skills demonstrated: profile-based tuning, material-specific parameter optimization, version-controlled feature release, and cross-functional collaboration with QA and release engineers to validate and ship new presets.
May 2025
March 2025
1 Commits
Mar 1, 2025March 2025 Monthly Summary – Ultimaker/Cura: Focused on stabilizing extrusion behavior by tuning retraction prime in the UM S8 CC+ profile, delivering a more reliable print path for 0.4mm nozzle and 0.2mm layer height. The change reduces extrusion issues after retraction and aligns with high-precision printing use cases.
March 2025
1 Commits
Mar 1, 2025March 2025 Monthly Summary – Ultimaker/Cura: Focused on stabilizing extrusion behavior by tuning retraction prime in the UM S8 CC+ profile, delivering a more reliable print path for 0.4mm nozzle and 0.2mm layer height. The change reduces extrusion issues after retraction and aligns with high-precision printing use cases.
February 2025
2 Commits • 2 Features
Feb 1, 2025February 2025 — Ultimaker/Cura focused on feature-driven quality improvements for single- and multi-material prints. Delivered Top Surface Flow Rate Alignment to align top-layer flow with material flow, reducing gaps and improving top-surface finish, with commit 3e250553a4790d6b6f3a8cea546ec26ac6e4e714. Implemented Simplify Multi-Material Retraction to avoid over-priming on the Ultimaker S8 by removing retraction_extra_prime_amount, with commit 0ba901e3454ecb459e46f05c4dc822ee6d060be8. Together, these changes enhance print reliability, reduce rework, and improve customer satisfaction. No explicit bugs were logged for this period in the provided data. Technologies demonstrated include firmware-level feature tuning, material flow control, and multi-material retraction simplification.
2 Commits • 2 Features
Feb 1, 2025February 2025 — Ultimaker/Cura focused on feature-driven quality improvements for single- and multi-material prints. Delivered Top Surface Flow Rate Alignment to align top-layer flow with material flow, reducing gaps and improving top-surface finish, with commit 3e250553a4790d6b6f3a8cea546ec26ac6e4e714. Implemented Simplify Multi-Material Retraction to avoid over-priming on the Ultimaker S8 by removing retraction_extra_prime_amount, with commit 0ba901e3454ecb459e46f05c4dc822ee6d060be8. Together, these changes enhance print reliability, reduce rework, and improve customer satisfaction. No explicit bugs were logged for this period in the provided data. Technologies demonstrated include firmware-level feature tuning, material flow control, and multi-material retraction simplification.
February 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 — Ultimaker/Cura: Factor 4 build volume temperature optimization. Implemented a targeted profile adjustment to optimize print conditions for Ultimaker Factor 4, setting Breakaway Build Volume Temperature (BVT) to a maximum of 40°C across multiple layer heights for the Factor 4 material. This work reduces the risk of over-temp conditions while maintaining material performance, improving print reliability for Factor 4 profiles. The change is documented under PP-547 and committed as 36534579edeb06d62fe42c0c951650aaae3c1bea, and has been validated against representative prints to support smoother production workflows.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 — Ultimaker/Cura: Factor 4 build volume temperature optimization. Implemented a targeted profile adjustment to optimize print conditions for Ultimaker Factor 4, setting Breakaway Build Volume Temperature (BVT) to a maximum of 40°C across multiple layer heights for the Factor 4 material. This work reduces the risk of over-temp conditions while maintaining material performance, improving print reliability for Factor 4 profiles. The change is documented under PP-547 and committed as 36534579edeb06d62fe42c0c951650aaae3c1bea, and has been validated against representative prints to support smoother production workflows.
Activity
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Quality Metrics
Correctness88.2%
Maintainability86.8%
Architecture82.0%
Performance79.4%
AI Usage20.6%
Skills & Technologies
Programming Languages
INIIniJSONPythoncfg
Technical Skills
3D Printing3D Printing Configuration3D Printing Slicer Configuration3D Printing Slicing Software3D printing3D printing configuration3D printing settingsConfigurationConfiguration ManagementConfiguration managementFirmware ConfigurationMaterial ScienceProfile ManagementQuality AssuranceSlicer Settings
Repositories Contributed To
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