The Pump-Chump (Blaster đồ chơi pump-action)

Pump-Chump (AKA Pump-Plinker V2): Pump-Action Toy Blaster w/ Printed Ammunition 

THIS IS STILL A WORK IN PROGRESS AS I WAIT FOR PARTS, ASSEMBLY VIDEO & MORE DETAILS WILL BE POSTED SOON. I AM POSTING THIS NOW FOR MY OWN RECORD KEEPING.

The Pump-Chump is a printed Pump-action blaster with gravity based shell “ejection”. This model has improved functionality over the Pump-Action Plinker V1 and looks a lot better in my opinion.

PRINTED PARTS:

CORE PARTS:

Walls/Top/Bottom:

Infill %:

Supports Required?:

Brim Required?:

Lower Frame

3+

15

Yes

Yes

Upper Frame

3+

15

Yes

Yes

Front

3+

15

No

No

Rear

3+

15

No

No

Grip

3+

15

Yes

No

Pump

3+

15

No

No

Barrel

4

15

No

Yes

Bolt

4

25

Yes

Yes

Striker

4

25

Yes

No

Trigger

4

25

No

No

Striker Latch

4

25

No

No

Linkage Bar

5

25

Yes

No

Magazine Catch

3+

25

No

No

MAGAZINE PARTS:

Magazine

3+

15

No

No

Magazine Follower

3+

15

No

No

Magazine Base Plate

3+

15

No

No

Magazine Back Plate

3+

15

No

No

Long Magazine

3+

15

No

No

Long Magazine Base Plate

3+

15

No

No

Long Magazine Back Plate

3+

15

No

No

STOCK PARTS:

Stock

3+

15

No

No

Stock Attachment

5

25

Yes

No

Stock Rail

5

25

No

No

Stock Pad

3+

15

No

No

Stock Latch

3+

15

No

No

Shell Holder x 2

3+

15

No

No

SIGHT PARTS:

Sight

3+

15

Yes

No

Reticle

3+

15

No

No

HARDWARE:

M3 BOLTS & NUTS

Length (mm):

Number Needed:

5 mm

2*

12 mm

5

16 mm

6

20 mm

5

25 mm

4

M3 Nut

16

Sourcing Bolts & Nuts: Kits with all the required lengths of bolts can be found on Amazon or other e-commerce sites.

*The two 5mm bolts are mainly used to hold the linkage bar in position while the superglue dries, they are not necessary but will help make it stronger.   

COMPRESSION SPRINGS:

Description/Use:

Length (mm)

Wire Diameter (mm)

Outer Diameter (mm)

Inner Diameter (mm)

Striker Spring

65 mm

0.8 mm

10 mm

>8 mm

Magazine Spring

70 mm

0.6 mm

10 mm

>8 mm

Long Magazine Spring

100 mm

0.6 mm

10 mm

>8 mm

Pump Spring

60 mm

0.6 mm

10 mm

>8 mm

Striker Latch Spring (Pen Spring)

10-15 mm

0.3 - 0.5 mm

<5 mm

>3 mm

Magazine Catch Spring (Pen Spring)

15 mm

0.3 - 0.5 mm

<5 mm

>3 mm

Stock Latch Spring (Pen Spring)

15 mm

0.3 - 0.5 mm

<5 mm

>3 mm

Sourcing Springs: It is difficult to find springs of the exact length needed for the striker, magazine and pump, I purchased 305 mm springs on AliExpress and then cut them down to the needed lengths. The link I use seems to be regionally locked to Canada so I would recommend using the spring dimensions provided to help find an appropriate spring on Amazon or AliExpress.

The striker latch, magazine catch and stock latch springs can all be taken from Bic pens or mechanical pencils. Just make sure the inner diameter of the spring used for the magazine catch is >3mm

TOOLS:

Screwdriver

Sandpaper

Metal Files

Super Glue