Meade ETX-60 lens cap solar filter made with 4.5x5.25 inch welding glass.
Use shade 14 or 13 at least, shade 12 works too but at your own risk, minimise viewing with eyes, use for photograpy or filming.
Use glass filter not polycarbonate as it degrade optics.

Meade ETX-60 Welding glass solar Filter 114x137mm

ETX-60-Welding-glass-Filter-114x137.stl

ETX-60 viewfinder solar filter made from cardboard eclipse glasses.
Cut or disassemble glasses and insert and glue between two parts.
Printed in ABS to witstand heat but PTFE or PLA would work too.

Meade ETX-60 viewfinder solar filter

ETX-60-viewfinder-solar.stl

Adapter to fit the low cost Eclipsmart #94251 solar filter.
Fit snuggly on the ETX-60 objective.

Meade ETX-60 Eclipsmart adapter

ETX-60-Eclipsmart-adapter.stl

Skymaster 15x70 solar filter made from cardboard eclipse glasses.
Cut or disassemble cardboard glasses and insert between and glue the two parts.
I printed in ABS to witstand heat, I guess PTFE or PLA would be fine too.

Celestron Skymaster solar filters (minimalist)

Minimalist-Solar-filter-15x70.stl

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Meade ETX-60 Welding glass solar Filter 114x137mm

Meade ETX-60 viewfinder solar filter

Meade ETX-60 Eclipsmart adapter

Celestron Skymaster solar filters (minimalist)