Hi Guy´s !
I designed a new Version of my Stepper Motor Holder on Top for the Anycubic (https://www.thingiverse.com/thing:3191545), because I will use to have an Enclosure for my Anycubic I3 Mega. With the old Version I was a little bit too high in summary, but this new design will do the Trick. This Version fits perfectly on the Anycubic, and the Z axis can drive completely up without any limitation in hight.
Do you know the IKEA LACK Enclosure from this Guy ? for the Pursa I3 : https://www.thingiverse.com/thing:2864118
You can do the same for less than 100€ for your Anycubic I3 Mega. All you need is, go to the DIY Store and buy a bar with the measurement of 50x50mm (3m length) and cut it in 4 pices with each of 46cm (this are the new table legs you will need). Paint it in the colour you want to have. The rest is still the same as described in the i3 pursa Enclosure. The new and higher Table legs will be needed because the pursa is not that high as the Anycubic is. So now this gets you an total hight of 50,5cm in summary. And thats perfect.
And now you can use my Extruder holder for back down to feed the Filament from the Top of your new Enclosure.