Quoted from swinks:
from my experience and checking measurements with shapeways items there is a 0.2mm variance over size (I think from memory) in regards to the tolerance.
Shapeways will print the design solid unless you have it hollowed out but you will then need certain material specific breather / cleanout holes. Likewise with wall thickness it averages out at least 1.2mm wall thickness like for the collar to go around the shaft.
could you possibly extend the front about 1-2mm and then allow a recess for the screw head and maintain the screw on type feature but then maintain the sleeve style (with a slightly larger hole to be a size slide on fit) strengthened with a radius so the target is stronger than original. The down side is the target face sits out 2mm more than standard but if it is a end shot feature it shouldn't matter. Then it is easily removed and you can insure a decal over the screw head so it is a clean look.
The model had a diameter of 24mm. Final dimension was about 0.75 mm smaller than design. I'm assuming this is due to shrinkage as the material cools. Not sure on the process shapeways uses for nylon printing. I don't have an original target, but it appears to be the same size as a normal standup target which is about 0.030 to 0.040" larger than these are in finished form.
The part is solid for strength since it must hold up to ball impacts. I ended up adding a pilot hole to the back side slightly undersized for the target rod. The end user will need to drill out the hole to the final 3/16".
If anyone's interested in buying a pair of these search for 'Bad Cats' on the shapeways site. I changed settings so that others could order them (I don't have a shop or whatever, so there's no markup).
I'm about 20 games in on my parts without issue, but there's no guarantee that these will hold up or won't cause your game to spontaneously combust. Use at you own risk etc. etc.
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