ConceptResin prints shrink. How much depends on the specific resin used along with other factors such as the shape of the piece being printed. I was talking with Walt Gillespie of Rusty Stumps about this .. specifically small holes being different from what the CAD drawing specified. Since I was having the same problem I decided to make a test printing to address this. I am going to create a print that has holes that match AWG from 12 ga down to 30 ga. I will make holes in a block of solid resin and then various tubes with walls ranging from .15 mm to 1 mm. Once this is complete I can use an assortment of wires in various sizes which I can us a micrometer to get exact diameter of and test them in each of the holes therefore using the wires as a gauge to find the exact hole size after printing and shrinkage. I put everything into an Excel spreadsheet to get all the numbers I would need and later to record the results. |
CAD Hole Size
The plan being to print these holes in a solid block and then with both thin and thicker walls to see if there is a difference. |
SetupTo start I set up a grid to position the largest holes, the 12 ga with from left to right, AWG size then .15, .3, .6 and 1 mm wall thicknesses. |
![]() The final results were ..there was no difference between a hole in a solid block and one with even thin walls. I suspect that precision measurement would come up with a different result but I am simply trying to side wire of various sizes through the holes to find the smallest it will pass through. This is crude but fine for what I want .. to find what size holes I need to create in my CAD drawing for a certain size wire to pass through. That means I am going to ignore the wall size thing and just show the results for solid block, thin wall etc. |
Results
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Example
This hopefully helps take some of the guesswork out of printing small holes |
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