Support issue and bad surface  

RE: Support issue and bad surface

This model will never look nice and smooth if you print it in a single part, because supports are compulsory and they’re gonna leave marks, regardless if snug or organic.

If I had to print this model I’d split it in two by the middle and then join the two parts, adding a couple of connectors to ensure a good register, Additionally securing the two parts with glue, will give you a very solid print. Although the seam between the two parts would be somehow visible, the flat surfaces would be much nicer than if you used supports.

 Also, if this piece has to be strong, you need to increase the number of perimeters and the infill percentage, 10% infill and 2 perimeters is the very minimum.  I’d use 4 perimeters and 30% infill for better sturdiness.

See attached my version of the model in two parts.  

RE: Support issue and bad surface

Hi Arthur

Given your statements, I couldn't have it better. This is not a mistake I've done.

BTW I look at your version and you are using modifiers I don't even know their existence: like connectors ... I browsed all menus without finding any clues about it.

Would you mind to explain a little bit about it ? 

Regards

RE: Support issue and bad surface

Hi Arthur and Bonnie,

I will to cut solution. This asks a little bit mode processing but the surface is nicer.

As for Bonnie suggestion, are

Posted by: @bonnie219bailey

You're struggling with difficult support removal and poor surface quality on your Prusa MK4S prints, despite using Snug/Organic supports and Prusament. To improve this, focus on adjusting PrusaSlicer settings: critically, increase Contact Z distance slightly for easier removal and increase Top interface layers (e.g., to 3-4) for a smoother surface. Also, consider reducing Top interface spacing, optimizing print orientation to minimize supports, ensuring adequate cooling, and potentially slightly lowering your nozzle temperature. If you have an MMU, using soluble interface material is the best solution. 

Are you referring to "Top Z contact distance". This value is already set to 0.2 (max allowed value). Top interface layers is already to 3. I have an MMU but no soluble filament.

RE: Support issue and bad surface

0.2 may be the largest in the drop down but you can type whatever you want in there to increase the gap.
Same with number of top layers. Just make the value what you want. You have 50 layers if you want. Or a gap of 1mm or whatever works for you. For the mentioned pattern spacing the specific name is "Interface Pattern Spacing" which controls how closely the interface layer lines are printed.

The 2 part model will have been achieved using the Cut function, that has options for connectors. That has nothing to do with modifiers. Which are a different thing entirely.

Sounds like you need to go through the basics. Which incidentally is here https://help.prusa3d.com/category/prusaslicer_204

Cut tool - https://help.prusa3d.com/article/cut-tool_1779

Modifiers - https://help.prusa3d.com/article/modifiers_1767

RE: Support issue and bad surface

I'm not an expert by any means, but from what I've read, the orientation that it's printing in also significantly limits the strength of the printed object, because the layers are parallel to the face of the adaptor, meaning that stress where it's screwed into something will have just the layer adhesion for strength where the screw threads attach to the rest of the piece, and you'd do better to tip it up at an angle, or as Artur5 suggested, split it and print the halves on their sides (the Multiboard screws and peg attachment pieces all use this method to make the layers run along the length of the part, rather than across it, for greater strength).

RE: Support issue and bad surface

The 3mf file indicates that you have an MMU. So you may want to consider using PLA or PVA/BVOH as your support interface material, and set the interface distance to 0. Your flat model geometry would be ideal for it as it is unlikely the PETG would slide of the PLA interface.