what is the difference between the 3921 and 3922?

These two units are almost identical. The only differences are that the 3921 includes a flexible work light and a blade storage compartment on the side, while 3922 features a special side panel that folds open for easy clean up and blade changes. Also, the 3921 uses the two-direction adapter system for holding blades (better for pinned blades), while the 3922 uses a standard blade holding system (better for pinless blades).

Did anyone find out if a miter gauge or some type of guard can be used to make straight cuts?

If your material to be cut allows enough room on the table portion to attach a straight edge with clamps, it will work just fine. Make sure that your straight edge is aligned with the saw blade so you don't end up breaking blades. Lastly, the thicker the material, use blades that have fewer teeth per inch or TPI. I am using a 7 TPI blade to cut anything over 1/2 inch, so far, it is working but slow cutting.

I am new to scroll saws so have to ask. Is it worth the $40 difference in price for the 3921 over the 3920 and why.

I can't speak for the 3921, but the 3920 is okay at best, it's actually nice if you use pinned end blades. However if you plan on using pinnless blades I would suggest a diffirent saw. Hope this helps

ASIN	B07MC1HLNP
Best Sellers Rank	#152,817 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #497 in Power Saws
Blade Length	16 Inches
Blade Material	Iron
Blade Shape	Round
Blade material	Iron
Brand	WEN
Brand Name	WEN
Color	Black,orange
Colour	Black,orange
Customer Reviews	4.5 out of 5 stars 5,225 Reviews
Cutting Angle	90 Degrees
Global Trade Identification Number	00044459392019
Handle Material	Metal Alloy
Included Components	Scroll Saw
Item Dimensions L x W x H	67L x 33W x 37.5H centimeters
Item Type Name	WEN 3921 16-inch Two-Direction Speed Scroll Saw
Item Weight	11.57 kg
Manufacturer	WEN
Model Number	3921
Number of Teeth	60
Other Special Features of the Product	Brushless
Power Source	Corded Electric
Power source	Corded Electric
Special features	Brushless
Specification Met	EMC, GS, ISO 14001, OSHA
Speed	1600 RPM
Surface Recommendation	Wood
Surface recommendation	Wood
UPC	044459392019
Unit Count	1 Count
Voltage	120 Volts
Wattage	144 watts

WEN Variable Speed Scroll Saw, 16-Inch with Work Light (3921)

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