20mm macro tube, features lens lock pin.

Extension tube for macro photography designed with IDKWhatToPrint's lens lock system.

Increase magnification by stacking the tubes.

For electronically controlled lenses you need to set settings on manual mode beforehand and remove lens while holding [Shot Result Preview] / half pressing shutter.
 

External flash recommended for no lens shadow and to combat darkness.
 

I added alternative lever that uses M2x5mm (or longer cut to size) screw as a locking pin, it might scratch your lenses but is stronger and more reliable.

To secure the screw in the lever you can use some leftover plastic from supports/skirts and melt it with solder iron or you can leave it only screwed in but it might become loose over time because plastic there is quite thin.