Here are all of the 3D models you'll need in order to build and fly the Estes Pathfinder kit (#1997). it was produced and sold from 1998 to 1990.

STL parts supplied:
1) Fin can #1a - Cruciform (This will slide over the BT-60 tubing.)
2) Fin can #1b - Tri-form (This will slide over the BT-60 tubing.)
3) 5.5 inch (139.7mm) length x BT-60 (OD) fin can 2a (cruciform) (Integrated tubing coupler.)
Adjust airframe tubing length from 18 inches to 12.5 inches (317.5mm)
4) 5.5 inch (139.7mm) length x BT-60 (OD) fin can 2b (tri-form) (Integrated tubing coupler.)
Adjust airframe tubing length from 18 inches to 12.5 inches (317.5mm)
5-6) Motor mount rings for 24mm motors that will fit inside fin can 2a and 2b.
Estes BT-50 tubing will fit within these rings.
7) Fin (if you want to print fins and use them on your rocket.)
8) Fin with TTW (through the wall) tab
9) Fin with TTW (through the wall) tab Version 2 with slot to accommodate motor mount ring.
10-11) BT-60 to BT-50 Motor Mount Rings
To be used with Estes tubing.
12) BT-50/24mm motor mount block ring
13) Estes PNC-55AO Nose Cone https://www.thingiverse.com/thing:4554882
14) BT-60 to BT-55 Reducer/Transition https://www.thingiverse.com/thing:4962698

Kit Part Extras:
1)Simulated nozzles
https://www.thingiverse.com/thing:1243029
https://www.thingiverse.com/thing:4119920
https://www.thingiverse.com/thing:4497043
2) BT-50/24mm Motor Retainer (screw-on)
https://www.thingiverse.com/thing:4058299

Non-part Extras:
1) Fin slot cutting guide Cruciform (Can be used as a fin marking guide.)
2) Fin slot cutting guide Tri-form (Can be used as a fin marking guide.)
3) Fin Making Template (To be used with balsa, bassword or other material to make your fins.)
4-5) BT-60 to BT-50 Motor Mount Ring making templates (A and B)
6) Fin alignment guide

Parts you will need to supply:
1) Estes BT-50 x 2.75 inch (69.85mm) length tubing (for the 24mm motor mount tube)
1) Estes BT-55 tubing; 18 inch (457.2mm) length
2) Estes BT-60 tubing; 18 inch (457.2mm) length
3) Recovery System:
A) 2 x 12" (304.8mm) diameter hexagon parachutes 1.25mil thickness LDPE plastic
B) Shock cord mount (JimZ website kit instructions)
https://www.spacemodeling.org/jimz/est1997.htm
C) Shock cord 18" (457.2mm) length
D) Shroud lines 6 x 18" (457.2mm) length
4) Decals (JimZ website with use of decal paper. https://www.spacemodeling.org/jimz/est1997.htm
Upscale decals: https://stickershock23.com/product/estes-pathfinder/
5) 1/8 inch (3.175mm) thick balsa (if you are making your own fins)
6) Fin and launch lug marking guide (JimZ website kit instructions)
https://www.spacemodeling.org/jimz/est1997.htm
7) Launch lug for 3/16 inch (4.76mm) launch rod