RV level block

Printed with .6 nozzle at .42 layer height PETG. It can be printed with .4 nozzle but strength may be less. 

50 percent infill with 3 layers

This is a 3d scan so there are some imperfections but it works as it should. you take your own risk with any weight added to it as I cannot account for your printers layer adhesion vs mine. 

The cost at $12 rolls of PETG is about $4.20 each which is about the same as buying them, but being able to print a few if needed is nice. 

In the picture I have my truck on it which is about 2750 pounds so it does have some strength once again this is with my layer temp and .6 nozzle with .42 layer adhesion your setting may not be as strong.  If you look at the pictures with them on my deck that is after testing with driving on and off a few time on unlevel ground you will see no marks on the brown one which is the printed one.