Hello, I am trying to construct a scaled project of a house. I am using Proofgrade medium plywood mostly. The problem I am having is that I can’t choose correct size to cut for joints (90 degree), they are always loose and there is no use for using glue as well. Has anybody got any tip/idea?
Thanks.
Hello and welcome aboard 
If you are looking to make tabs or fingers fit tightly you have to include the width of the cut made by the laser in your calculations. Normally that is 0.005 inches. In Inkscape, you can set the line thickness to 0.005 inches and use Path > Stroke to Path that will create 2 lines on either side of that thickness so it will be exactly half the width of the cut when you just delete the inner line. You might want to try making some joints with scraps till you get exactly what you want.
For myself, I usually want to apply a discreet amount of wood glue so stuff does not come apart even when the fit is very tight, The exception is something like a hinge that may break and need replacement.
Welcome to the forum!
Good search words are “kerf” and “finger joints.” They’re popular post topics, so you’ll have lots to choose from! 
I’m moving this to an appropriate forum. Problems and Support is for technical support issues.
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