Clearance between parts printed simultaneously: what can you recommend?

[Martin Dashwood-Morris @memorris My Robox is a Blue Commercial Version]

I have seen, and even printed, models with several separate interlocked parts that are printed simultaneously. Each part is loose within the assembly but cannot be removed.

I want to print a nut and male thread and print these as one piece then separate them when the print is finished. It is a large thread, about 50mm diameter and a 10mm pitch. Does anyone have any recommendations about the clearance I should leave between the nut and the screw so I can separate them? Or should I print them individually and then clean all the support print from the threads afterwards?

Thanks

Martin

[Martin Dashwood-Morris @memorris My Robox is a Blue Commercial Version]

Oh yes, I tend to use ABS but would a different material be better?

[BHudson @bhudson I have several Robox units Kickstarter and Commercial Arizona, USA]

@memorris I would print them separately without support. Unless your threads have a lot deeper thread than I am used to, you should not need support material.

If you want to print them together, I suggest .15 mm to .2 mm. This should give you a clean break point without too much roughness.

I operate two Betas and one Production Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben

[hagster @hagster My Robox is a Blue Commercial Version UK]

I go for 0.3 for if they need to move freely and 0.1 for a tight interference fit. And 0.2 for anything in between.

[Henry @henry My Robox is a Blue Commercial Version Washington State USA]

I use PLA and with my designs i give the nut a 1 % bump in size to account for shrinkage. ABS might shrink to much.

[Pete @pete My Robox is a Blue Commercial Version CEL HQ Bristol UK]

We use 0.2mm along the Z axis when we print parts in the same material which need to be separated.

With different materials we can leave 0.0mm 🙂

 

X Y separation can be much closer but will depend on material and extrusion settings, a path which is wider than expected by the slicer may overlap.

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