Recently I have been testing various things to reduce this effect. Often I have tiny models with lots of small holes (a few mm diameter) at the bottom, so they need to be squished well onto the glass bed, to prevent the hole-outlines from being pulled off.
Things that help:
- Round the bottom edges with 0.3 or 0.4mm, maximum 0.5mm. I tried chamfers too, but they worked less good than rounds in my tests.
- Or if you have access to the design files: if you print the first layer with 0.2mm thickness, then manually reduce width of that layer by 0.1mm to 0.2mm. Ideally this reduction in outer size should be done in the slicer, and on the first layer only. But since that is not possible (yet?), you could simulate this effect manually in the design. If you reduce the first layer too much, it creates a worse effect: ugly overhangs, and a reduction in bonding strength. You need to try the optimum for your settings.
Make a small test object, and try each of these tactics. For example, design 6 blocks of 10mm x 10mm x 10mm, and give them rounds of 0.3, 0.4, and 0.5mm; and a first layer reduction of 0.1, 0.2, and 0.3mm.
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gr5 1,439
The bottom layer is tricky. If you don't squish it very well then it doesn't stick well. If you squish it too much then it sticks out. In my opinion the best fix is to read this guid in particular the section about "use chamfers to produce cleaner bottom edge".
http://support.3dverkstan.se/article/38-designing-for-3d-printing
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kmanstudios 1,047
That is a great link! I have saved the page so that I can study it and keep the reference. Major thanks!!<3
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