Perimeter overlap parameter (in tab Strength) #1861

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MrUnknownDE · 2026-04-05T20:39:37+02:00

MrUnknownDE commented

2026-04-05 20:39:37 +02:00

Originally created by @BMacours on 10/21/2025

Description

A new perimeter-overlap setting has been introduced to enhance wall bonding by increasing the default overlap between walls by a specified percentage. This percentage is calculated relative to the wall line width. Boosting this value improves adhesion, particularly when using small nozzles that may struggle to maintain consistent wall bonding across different directions.

This feature is compatible only with the classic wall generator.

Its primary benefit is maintaining dimensional accuracy more effectively than simply increasing the overall flow rate. For optimal results, a slight increase in the internal wall flow ratio (see #10641) combined with this perimeter-overlap setting can further improve wall bonding quality.

Note : the term "perimeter" is used internally within the C++ codebase, whereas "wall" is the terminology presented to end users

Screenshots/Recordings/Graphs

Parameter named "Extra wall overlap" in the strength tab :

Default wall overlap :

10% extra overlap :

20% extra overlap :

Max overlap is set to 50%

Naturally, increasing the overlap too much can lead to visible artifacts that compromise surface finish. However, if—like in my case—structural strength takes priority over visual perfection, this trade-off can be well worth it.

Tests

Extensive testing was conducted using a 0.20 mm nozzle on a printer (brand intentionally omitted) that consistently failed to achieve proper perimeter bonding when printing in the +X+Y direction.

Note: This pull request is a replacement of PR #10816, originally submitted in September. That earlier PR also introduced internal perimeter flow ratio adjustments but overlapped (an overlapping overlap feature, sic) with PR #10641. In contrast, this new perimeter-overlap PR focuses solely on wall overlap and does not include any parameters for internal perimeter flow ratio, which are now fully covered by PR #10641.

*Originally created by @BMacours on 10/21/2025* # Description A new perimeter-overlap setting has been introduced to enhance wall bonding by increasing the default overlap between walls by a specified percentage. This percentage is calculated relative to the wall line width. Boosting this value improves adhesion, particularly when using small nozzles that may struggle to maintain consistent wall bonding across different directions. This feature is compatible only with the classic wall generator. Its primary benefit is maintaining dimensional accuracy more effectively than simply increasing the overall flow rate. For optimal results, a slight increase in the internal wall flow ratio (see #10641) combined with this perimeter-overlap setting can further improve wall bonding quality. Note : the term "perimeter" is used internally within the C++ codebase, whereas "wall" is the terminology presented to end users # Screenshots/Recordings/Graphs Parameter named "Extra wall overlap" in the strength tab : <img width="448" height="551" alt="image" src="https://github.com/user-attachments/assets/b3be83dd-1520-4057-b27d-a5851e70a619" /> Default wall overlap : <img width="392" height="278" alt="image" src="https://github.com/user-attachments/assets/fb371869-d539-4b6f-b7d6-896afaa71e86" /> 10% extra overlap : <img width="398" height="281" alt="image" src="https://github.com/user-attachments/assets/e729ccc4-f1dc-4463-a261-9d8ff177cea3" /> 20% extra overlap : <img width="398" height="282" alt="image" src="https://github.com/user-attachments/assets/6cf90919-454e-426a-81ff-6b7fe58a820e" /> Max overlap is set to 50% Naturally, increasing the overlap too much can lead to visible artifacts that compromise surface finish. However, if—like in my case—structural strength takes priority over visual perfection, this trade-off can be well worth it. ## Tests Extensive testing was conducted using a 0.20 mm nozzle on a printer (brand intentionally omitted) that consistently failed to achieve proper perimeter bonding when printing in the +X+Y direction. Note: This pull request is a replacement of PR #10816, originally submitted in September. That earlier PR also introduced internal perimeter flow ratio adjustments but overlapped (an overlapping overlap feature, sic) with PR #10641. In contrast, this new perimeter-overlap PR focuses solely on wall overlap and does not include any parameters for internal perimeter flow ratio, which are now fully covered by PR #10641.

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Reference: github/OrcaSlicer#1861