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If no 3D Printer, I wound make the sliders of hardwood. Just send hardwood through a planer thicknesser to get 20mm for the width and then saw with table saw for 10mm thinkness,
Miter Gauge for Bosch RA1181 Router Table by DamianB2 3d model
Miter Gauge for Bosch RA1181 Router Table by DamianB2 3d model. Buy. Download. Print. Render.

If no 3D Printer, I wound make the sliders of hardwood. Just send hardwood through a planer thicknesser to get 20mm for the width and then saw with table saw for 10mm thinkness,