Screws won't fit

roman_herweg

Hi there,

I saw some videos about screws by now but the screws and nuts wont fit. I'm not sure what I,m missing.  I am using the Thread Creator tool. 

I tried to assign the exact ISO diameters to screw and nut but they won't fit. now I am trying full mm Numbers but it doesnt look like it will fit.

Thanks and Regards 

_anton

In PLA and PETG, I normally print holes equal to the diameter of the screw (e.g., 4mm for an M4 screw) - then the screw just makes its own threads. If it's a through hole and the screw fastens to something on the other side, I widen the hole by 0.4mm.

I've found that FDM-printing threads isn't terribly practical.

nick_papageorge073

Are you trying to 3d print a part with threads? Then thread in a store bought screw?

michael3424

Which thread form (1/4-20 etc)?  Are you using the thread specs for standards that are listed in Machinery's Handbook?

Keep in mind that 3D prints do not often print the exact dimensions specified.  If the threaded hole prints a little undersize and the male thread a little oversize, the former won't fit into the latter.

_anton

In PLA and PETG, I normally print holes equal to the diameter of the screw (e.g., 4mm for an M4 screw) - then the screw just makes its own threads. If it's a through hole and the screw fastens to something on the other side, I widen the hole by 0.4mm.

I've found that FDM-printing threads isn't terribly practical.

robert_scott_jr_

Even with a resin printer I've never had any luck with threads even as coarse as 1/4-20. I know I will have to follow up with a tap. - Scotty

GWS50

I usually use threaded brass inserts for threads in prints. Heat them a little and push them into to kind of melt/weld them in place. Works well and is surprising strong. Also means you can use thread lock if needed.