> buy an equatorial mount.
Unless you can find an EQ2 used, it's not really worth it. And even that is questionable regarding stability. The advantages do not outweigh the benefits of a sturdy rockerbox.
Visually, the focuser wanders to odd angles, a sturdy mount such as the NEQ3/CG4 costs more than a larger better telescope. For imaging deep-sky, the back-focus of the telescope and EQ2 isn't sufficient.
> laying around
Cool, what kind of eyepiece?
> printed
Oh, what 3D printer btw? :-)
> new eyepieces
Maximum overview
32mm Plössl for an overview, $15 no-name / ?$9
Planets
6mm 66° for planets (pushing things a little but given their price / performance and use in a future telescope, they are the best deal. $29 Amazon, sometimes on sale for ~$20, $23 from Marketplace/China.
In-between
(15mm Plössl or 66° type for example.)
Stay away from sets, cheap short eyepieces of older design (horrible eye-relief, small eye lens, useless)
(Older field-of-view simulation regarding planetary and maximum field of view, http://blog.pixelgiraffe.com/wp-content/uploads/2020/07/76-700-rev2.png)