This is a remix of the "Cutting Mat Riser + Stand" (https://www.thingiverse.com/thing:4424120).
The original svg was made for a 8.5 x 12'' cutting mat.
I reworked this svg to fit a A4 (22x30 cm) cutting mat.
I used this one: https://smile.amazon.de/gp/product/B0845BB7K4/
The main svg is meant to use for a lasercutter. It is designed for 4mm ply wood.
To build a prototype on my mk3s, I split up the parts into smaller pieces to fit on the printer. Theses are the stl files. I do not know how stable the printed frame is. I think, it might work well if you have no access to a laser cutter.
If you want to print the splitted parts, you have to print all parts named SchneidematteAussenteile... and SchneidematteInnenteile... twice. The parts named Schneidematte_Mittel... are needed once.
I printed them in 0.2 Quality setting in PLA and glued them with revell modell glue.
The author hasn't provided the model origin yet.